Free Fire’s warehouse setting meant cinematographer Laurie Rose had to set up a custom lighting system.

Set in Boston in 1978, the Ben Wheatley-directed movie tells of a gang of criminals who meet up in a warehouse in order to purchase arms. But a disagreement means that a full-on shootout ensues between the two parties making the transaction.

For her role as Justine, Brie admits the energetic sequences were tough going on her body.

“I don't think any of us knew there would debris on the ground, which is a game changer,” she told Empire magazine. “Mentally I'm fine, I feel very loved, but my body has taken it. We're all pretty beat up. I'm deeply bruised.”

The film’s cast also features Cillian Murphy and Armie Hammer. And when it came to filming the entire movie in the same location each day, Armie admits that it was a little strange.

“It feels like Groundhog Day,” he said. “Because you show up to work, shoot ten minutes, and you show up the next day, and you're right in the same spot, but five minutes later in the movie.”

Shooting in the same warehouse also proved challenging for the production team, especially when it came to controlling for variable factors in lighting and atmosphere.

Accordingly, cinematographer Laurie Rose created a lighting system that was controlled by an iPad which could be altered in the warehouse location at any time.

“The lighting had to be in place. That's relatively unusual. Usually any story might loop around a location and span different times of day, but the real-time nature of this killed that,” he explained.